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Assessing the autogenous shrinkage cracking propensity of concrete by means of the restrained ring test von Sören Eppers (2011, Kunststoffeinband)

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Produktinformation

Autogenous shrinkage is the major shrinkage component of concretes that contain much less water than would be required for complete hydration. This mainly applies to ultra-high strength concrete and, to a lesser extent, to high strength concrete. Both have particularly low water-cement ratios. The relative surplus of cement leads to an internal drying, irrespective of whether the concrete dries out to the ambient air or not. This process of so called selfdesiccation is associated with autogenous shrinkage which, if restrained, can lead to cracks, potentially impairing the in many respects outstanding durability of these kinds of concrete. Hence, to fully benefit from the advantages of high and ultra-high strength concrete, it is essential to minimize the risk of autogenous shrinkage cracking. Attempts to do so, however, require a reliable method for assessing this risk. Presently, there is no such method. Cracks are the result of relatively complex processes, in particular at early age as concrete properties change rapidly. A dependable assessment of the cracking risk requires comprehensive testing and a thorough understanding of the interacting parameters. Early age cracking in cementitious systems is not a new problem; cracking due to restrained drying shrinkage and thermal contraction has been examined at length. However, the investigation and prediction of stresses and cracks due to autogenous shrinkage brings about new challenges. The essential issue is the onset of stresses at very early age. This greatly increases the influence of creep and relaxation. Especially at stress levels close to failure this influence is highly non-linear and difficult to quantify, experimentally as well as mathematically. Another challenge is the fact that temperature strongly influences the autogenous shrinkage and, presumably, the cracking risk as well. From isothermal tests at different temperatures it appears that this influence cannot be accounted for by formulas conventionally used to describe the temperature dependency of cement hydration. The lack of clarity in this regard in part is a consequence of a series of methodological issues, most importantly the large number of different test methods and the difficulties in defining the onset of the autogenous shrinkage. The measurement of autogenous shrinkage, yet error-prone at constant temperatures, becomes particularly demanding at realistic temperature histories. The thermal deformations that inevitably superimpose the shrinkage strains are difficult to compensate for. At present there is no general agreement on how to measure the autogenous shrinkage under non-isothermal conditions. In brief, the current knowledge about the influence of creep and temperature on autogenous shrinkage, restraint stress and cracking is insufficient. Obviously the experimental methods need to be improved in order to overcome the existing deficiencies. The main aim of this study therefore is to contribute to this improvement. The experimental focus is put on tests of the autogenous shrinkage and on restrained ring tests. The common stress-strength failu

Produktkennzeichnungen

EAN
9783764005399
ISBN
9783764005399
eBay Product ID (ePID)
211525729

Produkt Hauptmerkmale

Produktart
Lehrbuch
Verlag
Verlag Bau+Technik
Autor
Sören Eppers
Format
Gebundene Ausgabe
Erscheinungsjahr
2011

Maße

Gewicht
356g

Zusätzliche Produkteigenschaften

Sprachausgabe
Englisch
Seiten
181 Seiten

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Assessing the autogenous shrinkage cracking propensity of concrete by means of the restrained ring test von Sören Eppers (2011, Kunststoffeinband)

Über dieses Produkt

Produktinformation

Produktkennzeichnungen

Produkt Hauptmerkmale

Maße

Zusätzliche Produkteigenschaften

Meistverkauft in Studium & Erwachsenenbildung

Anastasia, Tochter der Taiga von Wladimir Megre (Gebundene Ausgabe, 2020)

Das einzige Buch, das Du über Finanzen lesen solltest von Thomas Kehl (2022, Taschenbuch)

Hier sparen: Studium & Erwachsenenbildung

Tangram Metalldose Schmidt Spiel Solospiel Kinderspiel Chinesisches #5003796

Toni's Mealprep Küche ~ Antonia Elena Zimmermann ~ 9783949458910

Hebammenkunde von Karin Brendel (2020, Gebundene Ausgabe)

Carissa Broadbent / The Serpent and the Wings of Night (Crowns ...9783551585516

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